SDI''s Global Protection Against Limited Strikes program has undertaken the development of both solid-state laser and CO2 laser-based ladars. CO2 ladar development is intensively concerned with the reduction of system volumes and weights for orbital deployment, as can be seen in the development milestones of the LOWKATER space-traceable ladar system, Laser Imager Component Development, and a compact, multiple-CO2-laser ladar configuration for interceptor applications